6.25 
5.00 
3.75 
2.50 
1.25 
Fig. 5.37c. Estimated by nonparametric method. 
6.25 
5.00 
3.75 
2.50 
1.25 
Fig. 5.37d. Estimated by AR model fitting, AR(4). 
Fig. 5.37. (Continued) 
170 
